<?php
namespace app\mapi\common\image;
/**
* 拼接多幅图片成为一张图片
*
* 参数说明：原图片为文件路径数组，目的图片如果留空，则不保存结果
*
* 例子：
* <code>
* $ci = new CombineImage(array("./uploads/1.jpg", "./uploads/2.png"), "./uploads/3.png");
* $ci->combine();
* $ci->show();
* </code>
*
* @author yangjianhui
* @version 2020/6/13
*/
class CombineImage
{
/**
* 原图地址数组
*/
private $srcImages;
/**
* 每张图片缩放到这个宽度
*/
private $width;
/**
* 每张图片缩放到这个高度
*/
private $height;
/**
* 目标图片地址
*/
private $destImage;
/**
* 临时画布
*/
private $canvas;
/**
* CombineImage constructor.
*
* @param array $srcImages 需要图片路径数组
* @param string $desImage 输出目标图片地址
* @param int $width 输出后图片宽度
* @param int $height 输出后图片高度
*/
public function __construct(array $srcImages, $desImage = '', $width = 750, $height = 12144)
{
$this->srcImages = $srcImages;
$this->destImage = $desImage;
$this->width = $width;
$this->height = $height;
$this->canvas = NULL;
}
public function __destruct()
{
if ($this->canvas != NULL) {
imagedestroy($this->canvas);
}
}
/**
* 合并图片
*/
public function combine()
{
if (empty($this->srcImages) || $this->width == 0 || $this->height == 0) {
return;
}
/*压缩图片 计算压缩后的图片高度*/
/*获取所有图片高度*/
$heightAll = 0;
for ($i = 0; $i < count($this->srcImages); $i++) {
$srcImage = $this->srcImages[$i];
list($srcWidth, $srcHeight, $fileType) = getimagesize($srcImage);
if ($fileType == 2) {
$srcImage = imagecreatefromjpeg($srcImage);
} else if ($fileType == 3) {
$srcImage = imagecreatefrompng($srcImage);
} else {
continue;
}
$new_width = $srcWidth;//压缩后的图片宽
$new_height = $srcHeight;//压缩后的图片高
if($srcWidth >= 750){
$per = 750 / $srcWidth;//计算比例
$new_width = $srcWidth * $per;
$new_height = $srcHeight * $per;
}
// $heightAll+=$srcHeight;
$heightAll+=$new_height;
}
/*设置画布总高度 并固定宽度 开始压缩合成图片*/
$this->height = $heightAll;
$this->width = 750;
$this->createCanvas();
for ($i = 0; $i < count($this->srcImages); $i++) {
$srcImage = $this->srcImages[$i];
//获取原图的基本信息(切记不要https)
list($srcWidth, $srcHeight, $fileType) = getimagesize($srcImage);
$new_width = $srcWidth;//压缩后的图片宽
$new_height = $srcHeight;//压缩后的图片高
if($srcWidth >= 750){
$per = 750 / $srcWidth;//计算比例
$new_width = $srcWidth * $per;
$new_height = $srcHeight * $per;
}
if ($fileType == 2) {
// 原图是 jpg 类型
$srcImage = imagecreatefromjpeg($srcImage);
} else if ($fileType == 3) {
// 原图是 png 类型
$srcImage = imagecreatefrompng($srcImage);
} else {
// 无法识别的类型
continue;
}
// 计算当前原图片应该位于画布的哪个位置
$destX = 0;
if ($i == 0) {
$desyY = 0;
$desyY_pre = $new_height;
} else {
$desyY += $desyY_pre;
$desyY_pre = $new_height;
}
// $desyY += $srcHeight;
// echo $i."--".$srcHeight."--".$desyY."\r\n";
imagecopyresampled($this->canvas, $srcImage, $destX, $desyY,
0, 0, $new_width, $new_height, $srcWidth, $srcHeight);
// echo $desyY.'--';
}
// die;
// 如果有指定目标地址，则输出到文件
if (!empty($this->destImage)) {
$this->output();
}
}
/**
* 输出结果到浏览器
*/
public function show()
{
if ($this->canvas == NULL) {
return;
}
header("Content-type: image/jpeg");
imagejpeg($this->canvas);
}
/**
* 私有函数，创建画布
*/
private function createCanvas()
{
ini_set('memory_limit', '256M');
$this->canvas = imagecreatetruecolor($this->width, $this->height);
// 使画布透明
$white = imagecolorallocate($this->canvas, 255, 255, 255);
imagefill($this->canvas, 0, 0, $white);
imagecolortransparent($this->canvas, $white);
}
/**
* 私有函数，保存结果到文件
*/
private function output()
{
// 获取目标文件的后缀
$fileType = substr(strrchr($this->destImage, '.'), 1);
if ($fileType == 'jpg' || $fileType == 'jpeg') {
imagejpeg($this->canvas, $this->destImage);
} else {
// 默认输出 png 图片
imagepng($this->canvas, $this->destImage);
}
}
/*图片压缩*/
public function compressedImage($imgsrc, $imgdst) {
list($width, $height, $type) = getimagesize($imgsrc);
$new_width = $width;//压缩后的图片宽
$new_height = $height;//压缩后的图片高
if($width >= 750){
$per = 750 / $width;//计算比例
$new_width = $width * $per;
$new_height = $height * $per;
}
switch ($type) {
case 1:
$giftype = check_gifcartoon($imgsrc);
if ($giftype) {
header('Content-Type:image/gif');
$image_wp = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromgif($imgsrc);
imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
//90代表的是质量、压缩图片容量大小
imagejpeg($image_wp, $imgdst, 90);
imagedestroy($image_wp);
imagedestroy($image);
}
break;
case 2:
header('Content-Type:image/jpeg');
$image_wp = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromjpeg($imgsrc);
imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
//90代表的是质量、压缩图片容量大小
imagejpeg($image_wp, $imgdst, 90);
imagedestroy($image_wp);
imagedestroy($image);
break;
case 3:
header('Content-Type:image/png');
$image_wp = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefrompng($imgsrc);
imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
//90代表的是质量、压缩图片容量大小
imagejpeg($image_wp, $imgdst, 90);
imagedestroy($image_wp);
imagedestroy($image);
break;
}
}
}
?>
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